Crusher-head.



R'. BERNHARD.

GRUSHEB. HEAD.

` APPLICATION FILED APB..28,1908 938,546.

Patented NOV.2,1909.

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GRUSHER HEAD.

APPLIOATION FILED APR. 28.1908.

938,546. Patented Nov. 2, 9.

V 2 SHEETS-B 2.

15551168.9618. Inventor.

Atozueyg UNITED STATES PATENT OFFICE..

RICHARD BERNHARD, 0E MILWAUKEE, WISCONSIN, AssIGNoR To Pow-ER AND MIN-ING MACHINERY COMPANY, oF JERSEY CITY, NEW JERSEY, A CORPORATION or NEWJERSEY,

CRUSHER-HEAD.

Specication of Letters Patent.

'l Patented N0v.2,19o9.

Application led April 28, 1908. Serial No. 429,606.

To all whom it may concern:

Be it known that I, RICHARD BERNHARD, a citizen of the United States,residing at Milwaukee, county of Milwaukee, land State of Wisconsin,have invented certain new and useful Improvements in Crusher-Heads,fully described and represented in the fol# lowing specification and theaccompanying drawings, forming a part of the same.

This invention'relates particularly to that class of crushers for stone,ore and the like, known as gyratory Crushers, the especial ob`A ject ofthe invention being to provide a fastening for the crushing head whichshall be self tightening so as to keep the head tight upon the shaft. Inthis class of Crushers, it

is diicult to bore the heads so as to make a perfect fit. It has beencustomary, therefore, to zinc the head on the shaft so as to fill up anyspaces, but this leads to diiiiculty on account of the zinc shrinking incooling, thus loosening the head. In the'operation of these gyratoryCrushers, also, there is liability of loosening the head on the shaft,

whether the head is zinced on the shaft or not.

The present invention provides means by which the head is forced down onthe taper automatically in case the head becomes loose and rotates onthe shaft, thus keeping the head tight upon the shaft, the zinc beingexpanded into the bore on the head, if zinced on. I secure this resultby providing the shaft with a screw thread and the head with` a nut thatrotates with the'head and coacts with the shaft thread to force the headonto the taper by the rotation of the nut. A single thread on the shaftmay be used, as, for instance, when it is known during manufacture inwhich direction the machine will run and the head tend to rotate, andVthe invention broadly considered, includes construct-ions in which asingle thread is used. but a specific feature of the present inventionconsists in providing the shaft with bot-h right and left threads, sothat a nut with either left or right hand thread may be used on the headto co-act with one of the shaft threads to tighten the head, accordingto the direction 1n which the Crusher is to be operated.

A construction embodying the invent-ion in a simple form will now bedescribedin connection with the accompantying drawings, forming part ofthis speci cation, and

the features embodying the invention then specifically pointed out inthe claims.

In the drawings :-Figure 1 is a sectional perspective of a portion of aCrusher shaft above the tapered portion, the shaft A isv formed with twoscrew threads, one being a right hand thread and the other a left handthread, the upper thread 10, in the construction shown, being the righthand thread, and the lowerr thread 11 the left hand thread.

Secured to the head in any suitable manner so as to rotate therewith isa nut, cof acting with one of the threads 10, 11, according 'to thedirection in which the machine is operated and the head tends to turn.

In Fig. 1 the nut D is formed to co-act with the right hand thread 10,and in Fig. 2, the nut E is formed to co-act with the left hand thread11, the heads B in the two figures tending to rot-ate in the directionshown by the arrows on the shafts.

The nuts D, E are faced on the bottom to fit the top of the head B, andare shown as pinned t'o the head, the top of the head and the bottom ofthe nuts being provided with semi-circular radial grooves .2 receivingpiu 3. These grooves are suflicient in number and so arranged that, whenthe nut is tight.- ened on the shaft in setting up the machine, one pairof these grooves will come in line to vreceive the pin.

.The operation of the device is as follows The gyratory movement of theshaft tends to rotate the head on the shaft, which movement is preventedas long as the head is tight. If the head loosens and tends to rotate,it will cause the nut D in Fig. 1 or the nut E in Fig. 2 to rotate onthe shaft in the direction in which the head moves, and thus screw thenut down on the shaft and .force the head down on the taper and tightenthe head on the shaft.

While the invention is shown as applied to a solid head, it will beunderstood that itV is applicable also to heads made with an innercenter or core and an outer shell or mantle, as is common in this classof crush-l ers, and the solid head, or the center or mantle, may beformed in any manner desired. The taper or wedge surface onto which thehead is forced to tighten it may be provided in any suitable manner.

Y The invention is not limited to the use of the zinc or similar softmetal between the head and the shaft, although this is also to Crushersof other classes in which the head is liable to loosen and rotate orrthe shaft.

What I claim is 1. In a gyratory Crusher or the like, the

- combination 'with a crushing shaft having a taper and a screw thread,of a head, and a nut secured to the head tol rotate therewith on theshaft and co-aeting with the shaft `thread to force the head onto thetaper and tighten the head.

2.4In a gyratory Crusher or the like, the

combination with'a crushing shaft having a taper andy right and leftscrew threads, and a head, of a nut lsecured to the head to rotatetherewith and co-aeting with one of the shaft threads to force the headonto the taper and tighten the head.

3.' In a gyratory Crusher or theilike, the

RICHARD BERNHARD. lWitness-es:

L. F. SNYDER,

F. G. BECKER.

